{1,10}: Make Your Own Super Powers
The special characters you just learned about are some of the most commonly used characters in regular expressions, but there’s more. If ?, +, and * aren’t specific enough, you can define your own lengths using curly braces. Remember the yearPattern example that matches a sequence of exactly four digits? You can use the curly braces in three ways:
{n} matches the preceding character exactly n times.
{n,} matches the preceding character at least n times.
{m,n} matches the preceding character at least m times, ...
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